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Date: Tue, 07 Jul 2009 19:26:29 +0300
From: Avi Kivity <avi@redhat.com>
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Subject: Re: [Qemu-devel] [PATCH] qcow2: Fix L1 table memory allocation
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To: Kevin Wolf <kwolf@redhat.com>
Cc: qemu-devel@nongnu.org

On 07/07/2009 07:09 PM, Kevin Wolf wrote:
> Contrary to what one could expect, the size of L1 tables is not cluster
> aligned. So as we're writing whole sectors now instead of single entries,
> we need to ensure that the L1 table in memory is large enough; otherwise
> write would access memory after the end of the L1 table.
>
>
>       new_l1_size2 = sizeof(uint64_t) * new_l1_size;
> -    new_l1_table = qemu_mallocz(new_l1_size2);
> +    new_l1_table = qemu_mallocz(align_offset(new_l1_size2, 512));
>       memcpy(new_l1_table, s->l1_table, s->l1_size * sizeof(uint64_t));
>    

Unrelated note: using qemu_memalign() here would reduce the copying for 
cache=none.

-- 
error compiling committee.c: too many arguments to function